gpu: nvgpu: use coherent aperture for coherent buffers

Use sysmem_coherent aperture if the buffer mappings are requested
to be IO coherent. Use sysmem_noncoherent aperture otherwise. This
is implemented by adding a new coherent field to the GMMU attrs
struct.

Jira GPUT19X-17
Bug 1651331
Bug 200283998

Change-Id: I5cfb71b5913d4db50ebf10331b19f5a4216456bf
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master/r/1514438
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/mm/gmmu.c b/drivers/gpu/nvgpu/common/mm/gmmu.c
index 602dfb3b..55fbcd3f 100644
--- a/drivers/gpu/nvgpu/common/mm/gmmu.c
+++ b/drivers/gpu/nvgpu/common/mm/gmmu.c
@@ -747,6 +747,7 @@ u64 gk20a_locked_gmmu_map(struct vm_gk20a *vm,
                 .rw_flag   = rw_flag,
                 .sparse    = sparse,
                 .priv      = priv,
+                .coherent  = flags & NVGPU_AS_MAP_BUFFER_FLAGS_IO_COHERENT,
                 .valid     = !(flags & NVGPU_AS_MAP_BUFFER_FLAGS_UNMAPPED_PTE),
                 .aperture  = aperture
         };
@@ -805,6 +806,7 @@ void gk20a_locked_gmmu_unmap(struct vm_gk20a *vm,
                 .rw_flag   = rw_flag,
                 .sparse    = sparse,
                 .priv      = 0,
+                .coherent  = 0,
                 .valid     = 0,
                 .aperture  = APERTURE_INVALID,
         };